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运用数值模拟结合场协同原理,对螺旋槽管内充分发展湍流的流动和换热进行了分析。模拟以空气为工质,管壁温度恒定,分别选取了4种不同的螺纹节距和螺纹高度组成的16组结构参数。讨论了螺纹凸起,以及螺纹节距、螺纹高度变化对螺旋槽管场协同性能和强化传热能力的影响。结果表明:利用场协同原理,可以解释结构参数的变化对螺旋槽管传热效果的影响,并能够对强化传热元件的结构优化提供指导。通过对比,模拟所得Nu数与实验所得Nu数关联公式的计算结果基本一致。
The flow and heat transfer of fully developed turbulent flow in spiral grooved tube were analyzed by numerical simulations combined with synergistic field theory. The simulation uses air as the working fluid and the temperature of the tube wall to be constant. Sixteen sets of structural parameters are respectively selected from four different thread pitches and thread heights. The influence of the thread protrusion, the thread pitch and thread height variation on the synergistic performance and heat transfer enhancement of the helical fluted field was discussed. The results show that the use of field synergy principle can explain the influence of structural parameters on the heat transfer effect of spiral grooved tube and can provide guidance for structural optimization of heat transfer enhancement element. By comparison, the calculation results of the correlation formula between the Nu number and the Nu number obtained by the experiment are basically the same.